Criterion for Weak Spin-Orbit Coupling in Heavy-Fermion Superconductivity : Numerical Renormalization-Group Study(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

概要

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A criterion for effective irrelevancy of the spin-orbit coupling in heavy-fermion superconductivity is discussed on the basis of the impurity Anderson model with two sets of Kramers doublets. Using Wilson's numerical renormalization-group method, we demonstrate a formation of the quasi-particle as well as the renormalization of the rotational symmetry-breaking interaction in the lower Kramers doublet (quasi-spin) space. A comparison with the quasi-spin conserving interaction exhibits the effective irrelevancy of the rotational symmetry-breaking interaction for the splitting of two doublets Δ larger than the characteristic energy of the local spin fluctuation T_K. The relevance to lattice models is briefly discussed.
社団法人日本物理学会の論文
2005-08-15